blackmarket

noun
UK /ˌblæk ˈmɑːkɪt/
US /ˌblæk ˈmɑːrkɪt/

A black market is a secret place where people buy and sell things that are not allowed.

The police caught the men selling stolen phones on the black market.


OTHER MEANINGS

2. Buying or selling goods in a way that breaks the law.

Many rare animals are traded on the black market.

3. A hidden system of trade that avoids taxes or government rules.

During the war, food was often bought on the black market.

4. Used to describe something secret and not officially approved.

He bought a black-market ticket to the concert.